Insulator.



H. R. MARKEL.

INSULATOR.

APPLICATION FILED 111L131, 1911.

1,061,620, Patented May 13, 1913.

I Snow Wow STATES PATENT OFFICE.

runner n. nanxnn, or conmus,-omo.

insuna'ron.

' 1,061, 20. Speciflmfldn n w; new Patented May 13, 1913.

- Application fled July 81, 1911. Serial Io. 841,487.

To all whom it may concern. proved type of insulator, I aim to provide a in wires to studding wit most instances to a stress Be it known that I, HARLEY Mum, a citizen of the United States, residing at Columbus, in the county of Franklin and State of Ohio, have invented certain new and useful Improvements in Insulators, of which the following is a specification.

My invention relates'to an insulator and is particularly designed as. an im rovement upon the types of porcelain in ators now in use generally for'the urpose of'clampbin a building. n the production of my insulator I mainly aim to eliminate the undesirable eatures resulting from the use of coactive clamping, elements having, interfitting extensions and sockets of what might be termed a p idal' nature. In other words, itis aimed to eliminate shar edges as much as possible and to particular y avoid the use of such ed es for hearing points. In

the use of pyrami al interfitting connections and sockets, the chief drawback resides in Y 5 devised a medium of resisting this stress.

the fact that the clamping parts when in' actual use, vary as to their relative contiguity and, inasmuch as such a form of con nection is only'capable'of perfect fit at one 8111; ldesignate corresponding parts, am: in w 1c point, the parts are necessarily subjected in ater than theyare constructed to bear.

that very frequently insulators of this type are onl utilized for one wire and, as a matter of act, the general purpose in forming the insulator with two ooves or passages for the wires,'is to ren er the arts interchangeable in position. Consi ering that one wire is clam ed between the parts of an insulator, it wi be readily seen that a pyramidal interfitting connection will be thrown out of alinement-in such a manner that the main stress will inevitably be u on the point of the pyramidal extension an in a at many cases, will result in breaking o of the same. In view of this stress to which these devices are normally and constantly subjected, I aim to provide a structure of insulator wherein the bearing walls of the interfittin extensions and sockets are of such' a'form 1: they contact throughout regardless of the ace between the clamping elements; Thus f the clam ing elements are separated-b a quarter 0 an inch,

the are just as fir y fitted togetheras thou as they were separated'by an eighth of an inc ermore, in the production ofmy imthe wire tempora'r his will be more i readily understood when it is remembered and between the corrugated. sockets 5 desirably tapered inwardly tostructure wherein the mterfitting bearing points are disposed between the grooves the wire in the groove and drives the nail in onl 'a art of the We andsufiicient to clamp y P in osition. Thereupon, pliers are use for rawing the wire taut and in such action they have a leverage upon the insulator. This will inevitably 112 sult in a very severe twistin stress upon the upper portion of the insu ator and the insulator must therefore be constructed to 3 meet such a stress. At the.same time, there will be a stress of no mean (prioportion upon the base of the insulator an ave likewise ,The preferred embodiment of my invention is shown in the accompanying drawings, in which similar characters of refer- Figure 1 is a perspective view of my im-. proved insulator in assembled position, Fig. 2 is a'perspective view of the base of the insulator, and, Fig. Bis a'perspective view of the top of the insulator.

' It will be noted that the base is substantially of rectangular form as shown at 1 in the drawing and is provided upon its lower surface with lugs 2 preferably spaced, which are adapted to prevent rotation. resulting accidentally from twisting of the insulator necessarily incurred innormal application thereof. The upper end of the insulator is provided' with transverse grooves 3 preferably corrugated and spaced apart. Centrally dis osed and extending longitudinally throng this base 1 is an aperture; and upon either side of such aperture 4 formed in the edges of the base ooves' 3 are ward the'aperture 4, but having their walls its under surface with complemental trans versegrooves 7 likewise preferably corrugated and with an aperture 8 extending longitudinally therethrough. Upon either side of the aperture 8 and depending from the under surface of the top 6 and desirably located between the grooves 8, are pins 9 of a substantially triangular cross section, but having their surfaces rounded to eliminate sharp corners. Y

It will be noted that the sockets 5 and the pins 9 are disposed at opposite sides of the insulator and furthermore that their walls are vertical throughout, producing a continuous contact regardless of the relative degree of closure of the clamping members. The importance of this results in the fact that the upper section of the insulator, when in operation, necessarily precludes contact of the upper surface of the base with the generally, as hitherto stated, for clamping one wire only and there is necessarily a tilt ng strain. If the interfittingmembers are tapered downwardly to a point, such connections could not hold the members trom relative twisting as they would not be in contaotln relation. At any rate, there Aside from the above stated functions, 1 have provided a structure wherein sharp edges are practically obviated by the provision of the spaced inwardly tapering sockets. 'These spaced sockets further efiect ceiving passage-way. would be a ooseness which would greatly endanger breakage of the lug or lugs used.-

a bearing of maximum strength forthe remg screw, there being a wire retaining groove extending transversely across a lane face of said base upon oppos1te sides 0 said passage-way, said base portion being provided with diametrically opposed recesses located at its edges, extending longitudi'-' nall'y thereof and tapering inwardly, said recesses terminating short of said passage way and having rounded inner walls, a crown portion having a passageway for said retainingscrew which alines with the,

passage-way of the base. portion,transverse wire retaining grooves formed upon .opposite sides of said passage-way in a plane face of said crown portion-and jalining with the groovesof the base portion, and projecting diametrically opposed lugs located at, the edge of said crown portion and between said grooves, said lugs tapering in:

wardly and having rounded inner fa ces,th

longitudinal walls of said lugs, lying inpars,

allelism with the longitudinal walls of the recesses of the base portion, the said lugs being spaced outward ytrom said screw'relln testimony whereof ll afix my signature in presence of two witnesses.- HARLEYTR. 'MARKEL l Vitnesses;

Louise E. SMITH, BLANonn James. 

